Scientific Selection of Ultrafiltration Device for Industrial Water Projects

Scientific Selection of Ultrafiltration Device for Industrial Water Projects

The scientific selection of ultrafiltration deviceis the primary premise to ensure stable long-term operation of industrial water treatment systems and reduce post-operation maintenance costs. As a diversified configurable industrial liquid filter covering multiple structural forms and precision grades, different types of ultrafiltration devices including high-concentration interception Concentrated Ultrafiltration Membrane Equipment, high-precision staged filtration Dual Stage Ultrafiltration Equipment, mini portable Compact Small Scale Ultrafiltration Membrane Equipment and full-process integrated Complete Ultrafiltration Equipment can be selected according to raw water quality, water volume, site space and treatment objectives. This paper systematically sorts out device classification, membrane separation operating mechanism, core technical parameter selection indicators, factory quality identification standards and corresponding industrial application matching rules for ultrafiltration device selection, guiding global engineering purchasers and factory water management personnel to complete reasonable ultrafiltration device model selection.

Selection of ultrafiltration device cannot rely on single tonnage parameter alone; it needs to comprehensively evaluate raw water turbidity, organic content, suspended solid concentration, installation area, automatic control demand and later maintenance conditions. LEFILIER’s full series ultrafiltration devices provide targeted solutions for different selection demands, and each device corresponds to fixed applicable scenarios.

When users need material recovery, wastewater concentration and solid-liquid separation treatment with high organic load, it is recommended to select Concentrated Ultrafiltration Membrane Equipment. This device optimizes the membrane flow channel structure, enhances pollution resistance, and is suitable for the working condition of high pollutant accumulation on the membrane surface. For pharmaceutical water, electronic ultrapure water and food high-standard process water with strict outlet water requirements, Dual Stage Ultrafiltration Equipment is the preferred selection scheme; primary coarse filtration intercepts most large pollutants, and secondary fine filtration removes trace colloids to greatly reduce the pollution pressure of subsequent reverse osmosis membrane elements. For laboratory water supply, small workshop production water and temporary mobile water treatment equipment with small water demand, users can choose miniaturized Compact Small Scale Ultrafiltration Membrane Equipment, which occupies a small area and is convenient for transportation and quick installation. For new factory water stations and overall water system renovation projects that require one-stop delivery and no secondary assembly, integrated prefabricated Complete Ultrafiltration Equipment is the most economical selection way, with pipelines, pumps, control cabinets and membrane modules all assembled and debugged in the factory.

The core components that need to be focused on during ultrafiltration device selection include membrane material, molecular weight cutoff (MWCO), frame material and control mode. Conventional PVDF membrane is suitable for most industrial water environments, PES membrane is selected for food and pharmaceutical sanitary working conditions, and 304 stainless steel frame is the standard configuration for general industrial sites. The PLC automatic control system with pressure difference linkage backwashing is recommended for long-term unattended operation.

In the actual water treatment process, most ultrafiltration devices are used as the pretreatment section of reverse osmosis systems. Reasonable selection can stabilize the SDI value of RO influent water below 3, effectively avoid frequent fouling of reverse osmosis membranes, and cut the overall water system operation expenditure for enterprises.

All ultrafiltration devices adopt pressure-driven cross-flow physical sieving separation as the core working principle, and the difference of different devices is only the structural layout and graded interception design. After raw water is boosted by the feed pump to the working pressure range of 1.0 ~ 4.0 bar, the fluid flows tangentially along the surface of the ultrafiltration membrane filaments or membrane sheets.

Water molecules and dissolved small-molecule inorganic ions pass through the micropores of the membrane layer under pressure to form qualified purified water, which is collected and delivered to the clean water tank. Suspended particles, colloidal aggregates, bacteria, viruses and macromolecular organic substances larger than the membrane MWCO value are trapped on the membrane surface. The cross-flow water flow continuously scours the membrane surface, discharges most intercepted pollutants through the concentrated water pipeline, and prevents the filter cake layer from blocking the membrane pores.

When selecting ultrafiltration devices, purchasers need to judge product quality from multiple dimensions to avoid low-cost inferior products. First, check whether the membrane elements have complete test reports including bubble point test data; second, inspect the welding quality of the stainless steel frame to ensure no water leakage hidden danger; third, confirm whether the whole machine has passed the FAT factory acceptance test report before delivery.

All ultrafiltration devices produced by LEFILIER have passed ISO9001 quality system certification, CE safety certification and NSF61 food-grade material certification. Under standardized operation, the service life of PVDF hollow fiber membrane is 5–8 years, tubular membrane is 6–8 years. We provide complete product test documents for each batch of equipment for customer inspection during the selection and procurement stage, and support sample testing of raw water before formal ordering for large projects.

Q1: What are the most important three factors for ultrafiltration device selection?

A: Raw water quality index (turbidity, COD, suspended solids), actual required water output per hour, and the required automation level of the on-site water station are the three core decisive factors for model selection.

Q2: Can ultrafiltration device remove salt ions and reduce the TDS value of water?

A: Ultrafiltration only intercepts particulate matter, colloids and microorganisms, salt ions can freely pass through membrane pores. If desalination is needed, ultrafiltration device must be used as pretreatment matched with reverse osmosis equipment.

Q3: How to choose the MWCO value of ultrafiltration membrane when selecting a device?

A: High precision water (pharmacy/electronics) chooses 30~50 kDa; conventional industrial purification chooses 50 kDa; wastewater concentration and solid-liquid separation choose 100 kDa.

Q4: Is higher membrane flux better when selecting ultrafiltration device?

A: No. Excessively high design flux will accelerate membrane fouling frequency and shorten membrane service life. High-pollution raw water needs to select a lower safe flux value.

Q5: Is it necessary to choose fully automatic PLC control for small-flow ultrafiltration devices?

A: Small water consumption and manual regular inspection sites can select semi-automatic devices to save procurement cost; unattended water stations must select full automatic differential pressure backwashing control type.

Q6: What supporting pre-treatment facilities need to be equipped before the ultrafiltration device inlet?

A: It is necessary to install multi-media filter + security precision filter (5μm) at the front end to intercept large particle impurities and prevent hard particles from scratching the membrane surface and causing irreversible damage.

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